<template>
    <div class="category">
        <div class="container">
            <!-- 面包屑 -->
            <XtxBread>
                <XtxBreadItem to="/">首页</XtxBreadItem>
                <transition name="fade-right" mode="out-in">
                    <XtxBreadItem :key="topCategory.id">{{topCategory.name}}</XtxBreadItem>
                </transition>
            </XtxBread>
            <!-- 轮播图 -->
            <XtxCarousel :sliders="sliders" style="height:500px" />
            <!-- 全部二级分类 -->
            <div class="sub-list">
                <h3>全部分类</h3>
                <ul>
                    <li v-for="item in topCategory.children" :key="item.id">
                        <a href="javascript:;">
                            <img :src="item.picture" alt="">
                            <p>{{item.name}}</p>
                        </a>
                    </li>
                </ul>
            </div>
            <!-- 分类关联商品 -->
            <div class="ref-goods" v-for="item in subList" :key="item.id">
                <div class="head">
                <h3>- {{item.name}} -</h3>
                <p class="tag">{{item.desc}}</p>
                <XtxMore />
                </div>
                <div class="body">
                <GoodsItem v-for="g in item.goods" :key="g.id" :goods="g" />
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import { computed, ref, watch } from 'vue';
import { findBanner } from '@/api/home.js'
import { useStore } from 'vuex'
import { useRoute } from 'vue-router'
import GoodsItem from './components/goods-item.vue'
import { findTopCategory } from '@/api/category.js'

export default {
    components: { GoodsItem },
    setup() {
        // 轮播图
        const sliders = ref([])
        findBanner().then(data => {
            sliders.value = data.result
        })

        // 面包屑 + 所有分类
        const store = useStore()
        const route = useRoute()
        const topCategory = computed(() => {
            let cate = {}
            const item = store.state.category.list.find(item => {
                // 必须返回！！！
               return item.id === route.params.id
            })
            if(item) cate = item
            return cate
        })

        // 推荐商品
        const subList = ref([])
        const getSubList = () => {
            findTopCategory(route.params.id).then(data => {
                subList.value = data.result.children
            })
        }
        watch(() => route.params.id, (newVal) => {
            newVal && getSubList()
            if (newVal && `/category/${newVal}` === route.path) getSubList()
        }, { immediate: true})

        return { sliders, topCategory, subList }
    }
}
</script>

<style lang="less" scoped>
@import '@/assets/styles/mixins.less';
.sub-list {
    margin-top: 20px;
    background-color: #fff;
    h3 {
        font-size: 28px;
        font-weight: normal;
        line-height: 100px;
        text-align: center;
        color: #666;
    }
    ul {
        display: flex;
        padding: 0 32px;
        flex-wrap: wrap;
        li {
            width: 168px;
            height: 160px;
            a {
                text-align: center;
                font-size: 16px;
                display: block;
                img {
                    width: 100px;
                    height: 100px;
                }
                p {
                    line-height: 40px;
                }
                &:hover {
                    p {
                        color: #27BA9B;
                    }
                }
            }
        }
    }
}

.ref-goods {
    background-color: #fff;
    margin-top: 20px;
    position: relative;
    .head {
      .xtx-more {
        position: absolute;
        top: 20px;
        right: 20px;
      }
      .tag {
        text-align: center;
        color: #999;
        font-size: 20px;
        position: relative;
        top: -20px;
      }
    }
    .body {
      display: flex;
      justify-content: flex-start;
      flex-wrap: wrap;
      padding: 0 65px 30px;
    }
  }
</style>